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Old 10-27-2012, 12:05 PM   #1
So Pitted OP
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Metal Chunks in Oil

First time post on here and was hoping I could get some helpful information on my 2000 yamaha xt 350 and it's recent problems. I only got this bike 2 months ago.

The bike was on the freeway at 65 (pretty much top cruising speed) and the engine died and a few seconds later the back tire stopped. No crash thankfully but when trying to kickstart it back up, the kickstart was completely jammed. Push starting didn't do anything but make the back tire skid when put in gear. So I drained the oil and found lots of shavings(silver not brass) and few metal chunks a little smaller than a pea. Any ideas of what I should be looking for when I take the top end off? If there is nothing up there I am guessing I will probably have to split the cases. So any words of advise are needed.

Thanks
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Old 10-27-2012, 12:33 PM   #2
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If you have chunks, unless they came from the piston the bottom half is going to have to come apart, which sadly is probably what you are going to have to do anyway.

At any rate, as you know the first thing to do is pull the head and cylinder and then look around. The piston may be stuck pretty good, so pull the plug and squirt some oil in there sooner rather than later but just realize the piston may not come out without some whacking involved.
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Old 10-27-2012, 12:39 PM   #3
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What he said. I'm guessing something in the transmission area
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Old 10-27-2012, 01:20 PM   #4
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Quote:
Originally Posted by sailah View Post
I'm guessing something in the transmission area
Yep, metal chunks from the top end.
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Old 10-27-2012, 01:56 PM   #5
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Jeez, guys having a bad day already
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Old 10-27-2012, 02:36 PM   #6
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Are the chips magnetic? If yes then lower end if not then the piston blew. Either way it's TOAST
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Old 10-27-2012, 07:07 PM   #7
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Couldn't a jammed cam chain be the problem? Will the bike roll if the clutch is pulled in or is not in gear?
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Old 10-27-2012, 08:36 PM   #8
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Crunched transmission if it doesn't release the wheel with the clutch.

Nothing good if the metal grits had time to circulate around the engine. You may be lucky but not what we found this week on a similar thumper with same symptoms altough that one restarted later after the incident, it sure doesn't sound good.

Just to play with the tools we stuck the borescope down the hole, did a leak down test and compression test, all failed.

If you are a new rider, here is what I know from experience....any hiccups and declutch quick as in REAL QUICK. May not help if it is the transmission crunching but may save your ass if anything else engine related.Looks like you were lucky once and so was the owner of that bike we just checked...... as I was many years ago .
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Old 10-27-2012, 08:47 PM   #9
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Originally Posted by So Pitted View Post
I will probably have to split the cases. So any words of advise are needed.

Thanks
Unfortunately you are right, it's all gotta come apart.... get a good manual.
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Old 11-05-2012, 04:39 PM   #10
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So I got the clymer manual and started taking her apart. In the camshaft casing, the font and rear chain guides were all torn up on the edges and it looked like the rear camshaft gear was wearing into the wall of the case. A pretty good groove was carved into the side. The timing marks were way off on The shafts and the lobes were pointing perpendicular to eachother. Deeper inside, I found where the metal chunks must have come from. The top of thepiston was really damaged and metal was all over. It was also BONE DRY in there. I had lots of oil come out when I emptied it. Does they mean the root of the problem is my oil pump? BTW there was plenty of oil in the camshaft housing.
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Old 11-05-2012, 04:48 PM   #11
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Hard to speculate but there are too many unknowns in that motor for me to rebuild it. I'd be shopping for a new used one and use yours as parts.
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Old 11-05-2012, 05:32 PM   #12
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hard to speculate but there are too many unknowns in that motor for me to rebuild it. I'd be shopping for a new used one and use yours as parts.
+1
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